This error is encountered to Windows 8 / 8.1 and Alongside Linux Machine.
This is because windows 8 does not completely shuts down your computer,
It removes all User data after shut down but keeps kernel data in hibernate mode.
This is reason being some (almost all) drives locked by windows.
Restart windows and say restart
Turn off fast shutdown
Why to restart and invest time in above solution now. to access drive rightaway, open terminal
sudo ntfsfix /dev/sda7
remember sda7 is because mydrive is sda7 check above error image
output of above commands is
bhushan@bhushan-desktop:~$ sudo ntfsfix /dev/sda7
Mounting volume… The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Attempting to correct errors…
Processing $MFT and $MFTMirr…
Reading $MFT… OK
Reading $MFTMirr… OK
Comparing $MFTMirr to $MFT… OK
Processing of $MFT and $MFTMirr completed successfully.
Setting required flags on partition… OK
Going to empty the journal ($LogFile)… OK
Checking the alternate boot sector… OK
NTFS volume version is 3.1.
NTFS partition /dev/sda7 was processed successfully.